c programmer this sketch shows how a user can pay for his or her bus fare using a mifare PICC card.
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this sketch enables a driver insert fare amount and a registered user scan his/her card
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afterwards fare deduction is being made, data is being posted to the server, connection to the server
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is made, and php scripts has been put in place to compare data and update the database
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Hardware required:
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ESP8266
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PCD (Proximity Coupling Device): NXP MFRC522 Contactless Reader IC
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PICC (Proximity Integrated Circuit Card): A card or tag using the ISO 14443A interface, eg Mifare or NTAG203.
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Liquid crystal display
Hardware connections
ESP8266 ----------------MFRC522 READER-------------162LCD------------RESISTORS---------44 KEYPAD A0---------------------------------------------------------------------1K ohm ------------R RST |_ 1K ohm -----------R GPIO16 |_ 1k ohm -----------R GPIO14-------------------SCK |_ 1k ohm-------------R GPIO12-------------------MISO | GPIO13-------------------MOSI | GPIO15-------------------SS | 3V3----------------------3V3 | GPIO1 | GPIO3 | GPIO5-----------------------------------------------SCL | GPIO4-----------------------------------------------SDA | |_ 4.7K ohm---------C GPIO0--------------------RST | |_ 4.7K ohm---------C GPIO2 | |_ 4.7K ohm---------C GND----------------------GND------------------------GND------------| | 4.7K ohm---------C 5V--------------------------------------------------5V---------------_|
the resistors were put in place such that once a key is pressed a particular voltage is read on the A0 pin of the ESP8266
the libraries included can be gotten from github repositories, search them online and download.